ceph: clear page dirty before invalidate page

clear_page_dirty_for_io(page) before mapping->a_ops->invalidatepage().
invalidatepage() clears page's private flag, if dirty flag is not
cleared, the page may cause BUG_ON failure in ceph_set_page_dirty().

Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/40862
Signed-off-by: Erqi Chen <chenerqi@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index e078cc5..b3c8b88 100644 (file)
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -913,8 +913,9 @@ get_more_pages:
                        if (page_offset(page) >= ceph_wbc.i_size) {
                                dout("%p page eof %llu\n",
                                     page, ceph_wbc.i_size);
-                               if (ceph_wbc.size_stable ||
-                                   page_offset(page) >= i_size_read(inode))
+                               if ((ceph_wbc.size_stable ||
+                                   page_offset(page) >= i_size_read(inode)) &&
+                                   clear_page_dirty_for_io(page))
                                        mapping->a_ops->invalidatepage(page,
                                                                0, PAGE_SIZE);
                                unlock_page(page);